Arc-light diffuser.



A. H. HAWKES.

ARG LIGHT DIFFUSER.

APPLICATION FILED 11111.28, 1911. 1,008,329 Patented NOV. 14, 1911.

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IINTTEB STATES PATENT QFFTCF.

ALBERT H. HAWKES, 0F NEW YORK, N. Y.

ARC-LIGHT DIFFUSER.

To all 'whom it may concern:

Be it known that I, ALBERT H. HAWKES, a citizen of the United States,residing at New York city, in the borough of Manhattan, county and Stateof New York, have invented certain new and useful Improvements inArc-Light Ditfusers, of which the following is a clear, full, and exactdescription.

The object of this invention is to provide a new and improved diffuserfor cutting od light for arc lamps.

In the use of arc lamps in theaters and elsewhere it is often necessaryto shut off the light. To turn off the current is not sufficientfor theglow of the carbons lasts an appreciable time whether the lamp is usedas an ordinary stage illuminating means or for stereopticon use.

According to this invention, I provide a pair of shutter slides, havingtogether a combined diamond opening by preference, which slides willapproach a line drawn between the arc and the center of the lens. Theslides are preferably formed so as to be parallel with the lens.Suitable mechanism is provided for operating the slides.

The scope of my invention will be pointed out in the claims.

In the accompanying drawings: Figure l is a sectional side elevation ofarc containing boxes provided with my improved invention. Fig. 2 is aface view of the slide mechanism without the outer boX. Fig. 3 is apartial section taken on line 3 3 Fig. 2.

As shown in the drawings, 1 is a boX or container for the arc mechanismprovided with a lens 3. Within the` boX 2 a casing or frame 3' isprovided, in which is mounted a frame 4 carrying the carbons 5 and 6.The frame 4 and the carbons' are diagrammatically represented in thedrawings. An aperture 7 in the front plate 8 is provided in line withthe arc and the center of the lens, and on the plate 8 are verticalguide strips 9, in which are mounted slides 10 and 11 overlapping oneanother, and provided Specification of Letters Patent.

Application filed January 28, 1911.

Patented Nov. 14, 191.1.

Serial No. 605,307.

each wit-h an angular opening, so that the two slides or shutters 10-11may occupy a position in Fig. 2 entirely free and clear of the opening7, but may be advanced toward each other to produce a diamond or squareshaped opening within the area of the opening 7 until the two slides areadvanced to such a degree that all light will be shut off from the boX.In order to advance the shutters simultaneously I provide on eachshutter a threaded lug 12, into which a right and left threaded screw 13is adjusted. A bearing 14 is provided for the screw at the top of theboX in this instance, and a beveled gear 15 secured fast on the screw. Abeveled gear 16 at the end of an operating rod 17, which is providedwith a handle 18 outside of the boX, is adapted for control by theoperator to move the shutters toward and from each other. In order tokeep the light at all times through the center of the lens from the arcI provide that the shutters shall move` on a line parallel with thelens, although the arc carbons in work of this character are placed onan oblique line for reasons well known in the profession,

I claim as my invention:

The herein described arc light dilfuser consisting of a source of lightand a light proof containing box therefor provided with an aperture, alens provided exterior to said box, a pair of shutters adapted tocollectively pass between the arc and the lens, and means for movingthem toward and away from each other, said mechanism consisting of ahandle and threaded connections between the handle and the shutters,said mechanism beingmounted upon the inclosing boX.

Signed at New York city, New York, this 21st day of October 1910.

ALBERT H. IIAWKES.

Vitnesses:

CHAs. F. PECK, WM. SooNs, Jr.

Copies -of this patent may be obtained for five cents each, byaddressing the Commissioner of Patents. Washington, D. C.

